Wednesday

September 17, 2014

September 17, 2014

Total # Posts: 24

**physics Classical Mechanics**

A pendulum of mass m= 0.9 kg and length l=1 m is hanging from the ceiling. The massless string of the pendulum is attached at point P. The bob of the pendulum is a uniform shell (very thin hollow sphere) of radius r=0.4 m, and the length l of the pendulum is measured from the ...
*January 12, 2014*

**PHYSICS(HELP)**

In the lecture, we discussed the case of an isothermal atmosphere where the temperature is assumed to be constant. In reality, however, the temperature in the Earth's atmosphere is not uniform and can vary strongly and in a non-linear way, especially at high altitude. To a...
*January 12, 2014*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

haha it's fun really. Do u a stand-up showan?
*January 12, 2014*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

A small block of mass m=1 kg glides down (without friction) a circular track of radius R=2 m, starting from rest at height R. At the bottom of the track it hits a massless relaxed spring with spring constant k= 9 N/m, which starts to be compressed as the block continues to ...
*January 12, 2014*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

@Greco b one more time
*January 12, 2014*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

A gunman standing on a sloping ground fires up the slope. The initial speed of the bullet is v0= 340 m/s. The slope has an angle α= 12 degrees from the horizontal, and the gun points at an angle θ from the horizontal. The gravitational acceleration is g=10 m/s2. (a) ...
*January 12, 2014*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

A pendulum of mass m= 0.9 kg and length l=1 m is hanging from the ceiling. The massless string of the pendulum is attached at point P. The bob of the pendulum is a uniform shell (very thin hollow sphere) of radius r=0.4 m, and the length l of the pendulum is measured from the ...
*January 12, 2014*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

A Venturi flow meter is used to measure the the flow velocity of a water main. The water main has a diameter of 40.0 cm, and the constriction has a diameter of 10.0 cm. The two vertical pipes are open at the top, and the difference in water level between them is 4.0 m. Find ...
*January 6, 2014*

**physics(URGENT!!!!!)**

A yoyo of mass m=2 kg and moment of inertia ICM=0.04 kg m2 consists of two solid disks of radius R=0.2 m, connected by a central spindle of radius r=0.15 m and negligible mass. A light string is coiled around the central spindle. The yoyo is placed upright on a flat rough ...
*December 8, 2013*

**physics(URGENT!!!!!)**

A ruler stands vertically against a wall. It is given a tiny impulse at θ=0∘ such that it starts falling down under the influence of gravity. You can consider that the initial angular velocity is very small so that ω(θ=0∘)=0. The ruler has mass m= ...
*December 8, 2013*

**physics(URGENT!!!!!)**

A source of sound emits waves at a frequency f= 650 Hz. An observer is located at a distance d= 170 m from the source. Use u=340 m/s for the speed of sound. (a) Assume completely still air. How many wavefronts (full waves) N are there between the source and the observer? N= ...
*December 8, 2013*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

Consider a rocket in space that ejects burned fuel at a speed of vex= 1.5 km/s with respect to the rocket. The rocket burns 8 % of its mass in 280 s (assume the burn rate is constant). (a) What is the speed v of the rocket after a burn time of 140.0 s? (suppose that the rocket...
*December 8, 2013*

**physics(URGENT!!!!!)**

A spherical non-rotating planet (with no atmosphere) has mass m1= 5 ×1024 kg and radius r1= 7000 km. A projectile of mass m2≪m1 is fired from the surface of the planet at a point A with a speed vA at an angle α=30∘ with respect to the radial direction. In...
*December 8, 2013*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

A merry-go-round (pictured) is sitting in a playground. It is free to rotate, but is currently stationary. You can model it as a uniform disk of mass 210 kg and radius 110 cm (consider the metal poles to have a negligible mass compared to the merry-go-round). The poles near ...
*December 8, 2013*

**physics(URGENT!!!!!)**

EDXers!!! Plz help with MITx 8.01x I don't know how to solve HW8 Problem 3 Question c) Can anybody help me???? Explain Plz
*November 20, 2013*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

it's wrong
*November 20, 2013*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

A gyroscope consists of a uniform disc of mass radius M= 1 kg and radius R= 0.3 m . The disc spins with an angular speed ω= 300 rad⋅s-1 as shown in the figure below. The gyroscope precesses, with its axle at an angle 30∘ below the horizontal. The gyroscope is ...
*November 20, 2013*

**physics(URGENT!!!!!)**

A block of mass m=2 kg on a horizontal surface is connected to a spring connected to a wall (see figure). The spring has a spring constant k= 12 N/m. The static friction coefficient between the block and the surface is μs= 0.6 , and the kinetic friction coefficient is &#...
*November 3, 2013*

**physics(URGENT!!!!!)**

An object of mass m=80 kg moves in one dimension subject to the potential energy U(x)=λ4(x2−a2)2+b2x2.(1) Here we use λ= 1 kg/(m2s2), a= 7 m, and b= -11 kg/s2. (a) How many equilibrium points (stable and unstable ones) does this potential have? n= 0.1.2.3.4. (b...
*November 2, 2013*

**physics(URGENT!!!!!)**

A meteorite of mass m= 2 ×104 kg is approaching head-on a planet of mass M= 7 ×1029 kg and radius R= 5 ×104 km. Assume that the meteorite is initially at a very large distance from the planet where it has a speed v0= 5 ×102 km/s. Take G= 6.67 ×10−...
*November 2, 2013*

**Astronomy**

I agree with you Anonymous...Gwerty-think!!!!
*October 1, 2013*

**Algebra**

9. The maximum value of N/S(N) is 100, and for N = 100, 200, 300, 400, ..., 900, we get the desired value of N/S(N).
*March 18, 2013*

**chemistry**

840.8
*December 14, 2012*

**teacher aide examniation number 02604200**

Dont cheat :( Cheating is wrong
*June 20, 2011*

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